"There was an error joining the Airport network..."
I have a refurbished G3 iBook with a new Airport card; it senses the network running three other macs in my house, but every time I try to join this or any other network with the iBook I get the error message "there was an error joining the Airport network". I'm using a Belkin router; no problem with the other macs. Is there some simple control or setting I'm missing?
MacBook, Mac OS X (10.4.10), Powerbook; G3 iBook